Inactivation of HAUSP in vivo modulates p53 function.

Inactivation of HAUSP in vivo modulates p53 function.
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DOI:
10.1038/onc.2009.427
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发表时间:
2010-03-04
期刊:
影响因子:
8
通讯作者:
Gu, W.
Gu, W.
中科院分区:
医学1区
文献类型:
--
作者:
Kon, N.;Kobayashi, Y.;Li, M.;Brooks, C. L.;Ludwig, T.;Gu, W.

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Hausp是一种去泛素化酶,已被证明可调节p53-Mdm 2通路。p53和Hausp的共转染通过从多泛素化的p53去除泛素部分来稳定p53。有趣的是,在人类细胞中敲除或RNA干扰介导的Hausp敲低也导致了由于Mdm 2的不稳定而导致的p53的稳定,这表明Hausp在p53激活中的动态作用。为了了解Hausp的生理功能,我们产生了hausp敲除小鼠。Hausp基因敲除小鼠在胚胎期E6.5和E7.5之间的早期胚胎发育期间死亡。hausp基因敲除胚胎显示p53激活,但没有明显的细胞凋亡增加。胚胎致死是由增殖和发育终止的急剧减少引起的,部分原因是p53激活和/或p53独立功能的废除。虽然p53的缺失并没有完全挽救hausp敲除的胚胎致死性,但在hausp和p53双敲除胚胎中,胚胎发育都得到了延长。这些数据表明Hausp在调节p53-Mdm 2通路中具有关键作用。
Hausp is a deubiquitinase that has been shown to regulate the p53–Mdm2 pathway. Cotransfection of p53 and Hausp stabilizes p53 through the removal of ubiquitin moieties from polyubiquitinated p53. Interestingly, knockout or RNA interference-mediated knockdown of Hausp in human cells also resulted in the stabilization of p53 due to the destabilization of Mdm2, suggesting a dynamic role of Hausp in p53 activation. To understand the physiological functions of Hausp, we generated hausp knockout mice. Hausp knockout mice die during early embryonic development between embryonic days E6.5 and E7.5. The hausp knockout embryos showed p53 activation, but no apparent increase in apoptosis. Embryonic lethality was caused by a dramatic reduction in proliferation and termination in development, in part due to p53 activation and/or abrogation of p53-independent functions. Although deletion of p53 did not completely rescue the embryonic lethality of the hausp knockout, embryonic development was extended in both hausp and p53 double knockout embryos. These data show that Hausp has a critical role in regulating the p53–Mdm2 pathway.
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